Portal: Still Alive is an Xbox 360 Live Arcade exclusive edition of Portal released on October 22, 2008. It features the original game, with various new levels and 9 new achievements.

The additional content was modified from and based on the levels from the Portal: The Flash Version MapPack created by We Create Stuff[1] and contains no additional story-related levels, as confirmed by Doug Lombardi.[2] There was a slight change in the campaign, which included avoiding being crushed whilst going through a series of engines.

First, the player must shoot a portal at a camera ("vital testing apparatus"); it will fall on the floor. Then the player must put a portal above the turret sentry and another below the camera. The camera will fall on the turret knocking it over.

Like a Rat

Trap yourself in a test chamber so that GLaDOS has to help you continue.

Test Chamber 15: Once the player reaches the room with the slow moving lifts and the energy pellet, hit both buttons to reveal the ball receiver and travel there. The doors will close automatically.

Test Chamber 17: After the player places the companion cube on the switch closest to the incinerator, they need to go back in the level and find a few cameras. Then the player brings them back to the small room with the switch that activates the incinerator and carefully places them inside the doors. Remove the cube from the switch, and the cameras should keep the door propped open. (try again if the cameras fall out). If the player squeezes through the opening of the doors with the cube and remove the cameras while they are still inside, the doors will close, locking the player in until GLaDOS opens them.

Test Chamber 18: Once at the large room with the turrets and the energy ball launcher, after the turrets have been knocked over, press the button, and then quickly jump on the on the button's stand and into the energy ball catcher while the door is still open. Once inside, the door will shut, and will open once GLaDOS is done talking.